Mandrel for battery jars



Dec. l 1925- J. H. WAGENHORST MANDREL FOR BATTERY JARS Filed Oct. 10, 1921 I 2 Sheets-Sheet 'l IH Wbnf//Wa//far j da@ 6rd @/c Patented Dec. l, 1925'.

UNITED STATES JAMES H. WAGENHORST,

OF JACKSON, MICHIGAN.

MANnREL ron BATrERY JARS.

Application filed October 10, 1921. Serial N0. 506,655.

To all whom t may concern.'

Be it known that I, JAMES H. WAGEN- HORST, a citizen of the United States, residing at Jackson, in the county of Jackson and State of Michigan, have invented a cert-ain new and useful Improvement in Mandrels for Battery Jars, of which the following is a full, clear, and exact description, reference being had to the accompanying drawlings.

This invention relates generally to the formation of storage battery jars and more particularl to an improved construction of mandrel a apted for use in battery ar forming machines. Hereinbefore, itV has been usual to form each cell separately upon the mandrel; vulcanize the same and then remove it from said mandrel and then assem ble a plurality of such cells in a suitable box or case to provide a complete battery.

The object of the presentinvention is to provide a mandrel upon which a jar comprising a plurality of cells can be made at one time. That is, a jar comprising sides, ends and bottom sub-divided by partitions into the desired number of cells, each cell 'being provided with the plate supporting lugs or feet in .the bottom thereof. By means of a mandrel of this character a great saving of time and labor will be effected and more uniformly accurate jars produced thereon. Another object of my invention is to not only provide for the forming of a multiple cell jar upon the unitary mandrel, 35 but also to provideI for stripping the vu'lcanized jar from the said mandrel. With these various objects in view the invention consists of the novel features of construction hereinafter fully described and set forth in the appended claims. A.

In the drawings forming a part of this specification, Fig. 1 is a perspective view of a mandrel for battery q'ar machinesV constructed in accordance with my invention; Fig. 2 is a. sectional view on the line 2-2 of from the mandreljFig. 6 is'a vertical sec" v tional view on the line 6 6 of Fig. 5; Fig. 7

is a vertical sectional vlew of a slightly modified form of the device; Fig. 8 is a' sectional elevation on the line 8-8 of Fig. 7 and Fig.

9 is a detailed perspective view of abattery' inasmuch as said lead covered mandrel can 'Fig. 3; Fig. 3 is a. section on the line 3-3 of j ar formed upon my improved construction of mandrel, one corner of said box beingbroken away in order to disclose the lugs or feet in the bottom of one cell. In F 1g. 1 I have shown amandrel capable of formmg a jar comprising three cells, each .cell having supporting lugs or feet formed 1n the bottom thereof to provide a suitable support for the plates of the storage battery. This improved form of mandrel comprises a base4 portion A and cell-formin portions B. These cell-forming portions are spaced apart as shown at C a distance equal to the thickness of the partition wall which subdivides the jar intol separate cells .and the end of each cell-forming portion D is grooved or recessed to receive the lugs or feet as more fully described hereinafter. This unitary mandrel body consisting of the base portion A and the spaced cell-forming portions B is preferably made of cast metal and in practice I prefer to cast the same hollow as indicated in Figs. 2 to 7 inclusive and in order to provide the necessary strength, each cell-forming portion is provided with a central brace' B as most clearly shown in Figs.. 2 and 4. The cast metal mandrel is preferably covered by a thin envelopeor coating of lead or an alloy rich in lead as indicated at E in Figs. 2 to 7, inclusive. This coating of lead serves to prevent the adhesion of the rubber to the mandrel,

be polished' very smooth and is not affected by the various ingredients of the rubber dur. ing the vulcanization process and consequently with a lead covered mandrel there will be little or no difficulty in stripping the jar from the mandrel after vulcanization has taken place.

In operating with a mandrel such as herein shown and described, I first place strips' of rubber in the recesses or spaces C, these strips being cut .to accurately fit and completely lill-the spaces. The ves or reioo cesses D are then filled with the rubber lugs y or feet which are valso shaped to accurate fit into the said grooves or recesses. A sheet of rubber which forms the bottom of the jar is then placed upon the end of the mandrel and another sheet which forms the sides and ends of the jar is wrapped around the mandrel and secured. Thls operation is accomplished either by hand or any suitable mechanism ca able of such operations It will) thus be seen that this unitary mandrel 'serves as the'means for shaping the Y,

sides andends of the box but also the means for positioning and holding the subdividingfpartitions and also'the'lugs or feet of each cell;- and by means of which a one piece Jar comprising a plurality of cells is prol vided.

After the battery jar has been formed in the manner indicated the mandrel with the jar. thereon is placed in the vulcanizer and the battery jar vulcanized. After the same hascooled, it is stripped from the mandrel and said mandrel is then ready for use in the formation of-other iars. Heretofore it has been customary to apply hooks to the edgesy of the jar and pull them from the mandrel, but so far as I am aware only single cells have been vformed upon a mandrel; whereas in the present instance a plurality of separated or partitioned cells are formed in a one-piece jar and consequently in -order to strip the iar ofthis type from themandrel I propose to provide openings E in the base of the mandrel and in line xwith the partition spaces C soA that stripping ingers can be proiected upwardly through said openings, and brought into engagement with the ends of thepartitions so asto exert an Iupward pressure from the cent .portion of the jar either simultaneo y with hooks applied to the exterior edges or not, as preferred. In Figs. 7-and 8 have shown a slightmodication in which strips G are placed at the bottom of. eachfrecess C, the endsvof said stri s pro.

ecting beyond the edges of the man rel and y raising' said strips towards the end of the mandrel the vulcanizediar can be quickly and easil vvstripped from the mandrel. In practice prefer to make the base A somewhat larger than the mandrel proper for ease in handling and also for protection durcell ing the vulcanizing process as the mandrels can be rapidly pushed into 'the vulcanizer and their bases only will contact, thereby preventing two or more jars contactin with each other and becoming connected during the vulcanizing process.

,By means of a mandrel such as herein shown and described, I am able to form a battery jar comprisingl a plurality of cells in much less time than the same number of separate cells could be formed; and furthermore, a more accurate device so far as dimensions are concerned can be roduced.

Having thus described my invention, what I claim is:

1. In a battery jar mandrel a base, and a plurality of spaced cell forming portions extendin upwardly therefrom, the area of the base ing greater than the areas of the ortions whereby a lateraledge is provided, said cell portions having an enveloping covering of lead or an allov rich in lead.

-2. In'a battery jar mandrel` a plurality of spaced cell forming portions and a base to which said portions are united, said base extending laterally outward beyond said spaced portions, a covering of lead or an alloy rich in lead extending over: the cell forming portions and spaces therebetween, there being apertures in the base and covering between the cell forming portions and strips seated between the portions and covering the apertures. f f

3. A battery jar mandrel comprising a base havingga plurality of spaced cell formin portions extending upwardly therefrom,

sald cell portions having an envelopingy covering of a metal rich in lead.

In testimony whereof, I hereunto ailx my signature.

JAMES H. WAGENHoRsT. 

